Roadway



R. GREENE.

ROADWAY.

AFPLICATlON FILED OCT 29| 1920.

term them are, however, ordinarily imprac UNITED risa.

. Specification of Letters Patent.

' f v ROADWAY.

Application led October'29, 1952.0.` Serial No; 420,506.

To all whom it may concern; l Y

Be it known that I, ROBERT GREENE, a subject of the'King of Great Britain, and a resident of the city of London, in the county of Middlesex,Province of Ontario, Canada,

have invented certain new and useful Improvements in Roadways, of which the following is a specification.

My object in the present inventionvis `to devise a roadway which may be cheaply constructed and which will still afford mostv of the advantages of a road of the so-called permanent type, that is, roads formed mainly of concrete with or without a b1- tuminous or asphaltic surface.

I attain my object by substituting for the continuous surfaceof the ordinary roadI two relatively narrow strips of concrete or the like, the crown and haunches of the road being formed of less durable and cheaper material such as gravel or waterbound macadam. Such strips or twin trails as I ticable owing to rutsY forming at the edges of the strips in the softer material of the crown and haunches. An important further feature of my invention therefore lies in the means lI employ for the prevention of such ruts.

The invention is illustrated in thek accompanying .drawings in whichm Figure 1 is a plan view of a roadwayv constructed in accordanceV with my invention; and

Fig. 2 a cross section ofI part of the same.

In the drawings like numerals of. reference indicate corresponding parts in the different gures. 1 j

In its preferred form the roadway comprises two relatively narrow strips 1 of concrete or other road material of a type recognized as substantially permanent. These strips are laid on any usual foundation. Exterior to these strips are the haunches 2,

which will be of suitable road surfacing material generally recognized as of inferior durability, such, for example, as gravel or water bound macadam, though, of course, bituminous surfaced materials might be employed. Generally speaking, however, where it is desired to attain a maximum of utility havingv regard to cost, the haunches will be formed of gravel. The crown 3 between the strips 1 will usually be formed of any material suitable for the haunches l2.

The sides of each of the strips 1 will be formed of a continuous series of triangular projections 3 that is :to say, the sides of adjacent projections meet so that a series of I similar projections 5 are formed in thel gravel when the latter is in place.

,- The result of this arrangement is that the gravells held between the projections of the fconcrete, and the level of the road is preserved. I find by experience that the gravel packs in the serrations of the concrete 1n such a way that ruts Or depressions are not formed. f

It will `be evident, of course, that the same form ofledging may be applied to a .con crete or similar roadway which extends completely across the roadand which is proratented May 31, 1921.

vided with haunches of a dilferent material. 'Y

What I claim asmy invention is 1. In a road surface, va longitudinal strip of hard road material and an adjacent strip of relatively softer or less permanent material, the hard material having a continuous seriesof triangular projectlons formed integral therewith along itsedge and forming triangular recesses-into which the softer Y material ofthe adj acentv strip extends.

2. In a roady surface, a longitudinal strip of hard road material and an adjacent strip of relatively softer or less permanent material at each side thereof, the hard material having a continuous series of triangular projections formed integral therewith along each side and forming triangular recesses into which the softer'material of the adjacent strip extends. v

3. A road surface comprising twov parallel wheel strips of hard or permanent road ma-` Y crown of gravel, each edge of each of the wheel strips having a continuous series 0f triangular projections formed integral therewith and forming triangular recesses into which the gravel of the haunches and crown extends.

Signed at London, this 14th day of Oc--y tober, 1920. ROBERT GREENE. Witnesses A CHAs. H. IVY, l LEMAN SnmmNG'roN. 

